I’m relatively new to programming and I’m trying to write an application that outputs the hexadecimal representation of a file into a text file, then writes the bytes into a vector of unisgned chars and basically creates a copy of the original file. The problem I’m running into is that the application ends up outputting an empty file. Otherwise, the code appears to work fine; the text file contains the hexadecimal representation of the bytes and the bytes are correctly written into the byte vector. I apologize for the crappy code in advance.

int main()
{
    ifstream ifile;
    ofstream ofile;
    ofstream ofile2;
    ifstream ifile2;
    string filename;
    unsigned char byte;
    unsigned int hexnum = 0;
    vector <unsigned char>charvec;

    cout << "input file name" << endl << endl;
    cin >> filename;

    ifile.open(filename, ios::binary);
    ofile.open("OUT" + filename + ".txt");

    if (ifile)
    {
        while (ifile >> byte)
        {
            ofile << "0x" << hex << static_cast<int>(byte) << ' ';
        }
    }
    else
    {
        cout << "file not open";
    }

    ifile.close();
    ofile.close();

    ifile2.open("OUT" + filename + ".txt");
    ofile2.open("OUT" + filename, ios::binary | ios::out);

    if (ifile2)
    {
        while (ifile2 >> hex >> hexnum)
        {
            charvec.push_back(hexnum);
        }
    }
    else
    {
        cout << "file not open";
    }
   
    // checking the contents of the byte vector    
    for (char i : charvec)
    {
        cout << i << ' ';
    }
    
    copy(charvec.cbegin(), charvec.cend(), ostream_iterator<unsigned char>(ofile2));
   
    Sleep(10000000);
}